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spelunker

[spi-luhng-ker] /spɪˈlʌŋ kər/
noun
1.
a person who explores caves, especially as a hobby.
Origin
1940-1945
1940-45; < Latin spēlunc(a) cave (≪ Greek spêlynx, stem spēlyng-, akin to spḗlaion; cf. spelaean) + -er1
Related forms
spelunking, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for spelunker

spelunker

/spɪˈlʌŋkə/
noun
1.
a person whose hobby is the exploration and study of caves
Derived Forms
spelunking, noun
Word Origin
C20: from Latin spēlunca, from Greek spēlunx a cave
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for spelunker
n.

"a cave bug; one who explores caves as a hobby," 1942, agent noun formed from obsolete spelunk "cave, cavern."

Online Etymology Dictionary, © 2010 Douglas Harper
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